/* roulang page: index */
:root {
      --primary: #0A84FF;
      --primary-glow: rgba(10, 132, 255, 0.5);
      --accent-green: #00D4AA;
      --accent-orange: #FF6B35;
      --bg-deep: #080C14;
      --bg-card: rgba(10, 132, 255, 0.06);
      --border-card: rgba(10, 132, 255, 0.15);
      --text-primary: #FFFFFF;
      --text-body: #B0C4DE;
      --text-muted: #7B8FA1;
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-sm: 8px;
      --radius-pill: 50px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 16px 48px rgba(10, 132, 255, 0.2);
      --font-sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "SF Mono", "Cascadia Code", "Consolas", monospace;
      --backdrop-blur: 20px;
      --transition: all 0.3s ease;
    }

    * {
      box-sizing: border-box;
    }

    body {
      background-color: var(--bg-deep);
      font-family: var(--font-sans);
      color: var(--text-body);
      line-height: 1.8;
      margin: 0;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    /* 自定义滚动条 */
    ::-webkit-scrollbar {
      width: 6px;
    }
    ::-webkit-scrollbar-track {
      background: #0a0f17;
    }
    ::-webkit-scrollbar-thumb {
      background: var(--primary);
      border-radius: 3px;
    }

    a {
      color: var(--text-body);
      text-decoration: none;
      transition: var(--transition);
    }
    a:hover {
      color: var(--primary);
    }

    /* 玻璃拟态基础卡片 */
    .glass-card {
      background: rgba(10, 132, 255, 0.04);
      backdrop-filter: blur(var(--backdrop-blur));
      -webkit-backdrop-filter: blur(var(--backdrop-blur));
      border: 1px solid rgba(10, 132, 255, 0.12);
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-card);
    }

    .glass-card-hover {
      transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s;
    }
    .glass-card-hover:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }

    /* 按钮系统 */
    .btn-primary-glow {
      background: var(--primary);
      border: none;
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      color: #fff;
      font-weight: 600;
      box-shadow: 0 0 24px var(--primary-glow);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.3px;
    }
    .btn-primary-glow:hover {
      background: #1A94FF;
      box-shadow: 0 0 40px rgba(10, 132, 255, 0.8);
      transform: scale(1.03);
      color: #fff;
    }

    .btn-glass {
      background: transparent;
      border: 1px solid rgba(10, 132, 255, 0.3);
      backdrop-filter: blur(10px);
      border-radius: var(--radius-pill);
      padding: 14px 36px;
      color: var(--text-body);
      font-weight: 500;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-glass:hover {
      border-color: var(--primary);
      background: rgba(10, 132, 255, 0.1);
      color: #fff;
    }

    /* 导航样式 */
    .navbar-custom {
      background: rgba(8, 12, 20, 0.8);
      backdrop-filter: blur(25px);
      -webkit-backdrop-filter: blur(25px);
      border-bottom: 1px solid rgba(10, 132, 255, 0.15);
      padding: 12px 0;
    }
    .logo-text {
      font-weight: 700;
      font-size: 1.5rem;
      background: linear-gradient(135deg, #fff, #b0d4ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      letter-spacing: 1px;
    }
    .nav-link-custom {
      color: var(--text-body) !important;
      font-weight: 500;
      margin: 0 8px;
      position: relative;
    }
    .nav-link-custom.active {
      color: #fff !important;
    }
    .nav-link-custom.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--primary);
      box-shadow: 0 0 12px var(--primary);
      border-radius: 2px;
    }
    .search-icon {
      color: var(--text-body);
      font-size: 1.2rem;
      cursor: pointer;
      transition: var(--transition);
    }
    .search-icon:hover {
      color: var(--primary);
    }

    /* Hero区域 */
    .hero-section {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(10,132,255,0.08) 0%, transparent 50%);
      position: relative;
      overflow: hidden;
    }
    .metric-card {
      background: rgba(10, 132, 255, 0.05);
      backdrop-filter: blur(16px);
      border: 1px solid rgba(10,132,255,0.2);
      border-radius: var(--radius-md);
      padding: 20px 16px;
      text-align: center;
      box-shadow: 0 8px 20px rgba(0,0,0,0.3);
    }
    .metric-value {
      font-family: var(--font-mono);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--accent-green);
      text-shadow: 0 0 15px rgba(0,212,170,0.5);
      line-height: 1.2;
    }

    /* 区块标题 */
    .section-title {
      font-size: 28px;
      font-weight: 600;
      color: #fff;
      margin-bottom: 16px;
      padding-left: 18px;
      border-left: 4px solid var(--primary);
      box-shadow: 0 0 15px rgba(10,132,255,0.3);
    }

    /* 服务卡片 */
    .service-icon {
      font-size: 2.2rem;
      color: var(--primary);
      margin-bottom: 18px;
    }

    /* 对比卡片 */
    .compare-card-traditional {
      background: rgba(255,255,255,0.03);
      border: 1px solid rgba(255,255,255,0.08);
    }
    .compare-card-sa {
      background: rgba(10,132,255,0.08);
      border: 1px solid var(--primary);
      box-shadow: 0 0 25px rgba(10,132,255,0.25);
    }

    /* FAQ */
    .accordion-button-custom {
      background: rgba(10,132,255,0.03);
      border-bottom: 1px solid rgba(10,132,255,0.08);
      color: #fff;
      font-weight: 500;
      padding: 20px 24px;
      border-radius: 0 !important;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(10,132,255,0.08);
      color: #fff;
      box-shadow: none;
    }
    .accordion-button::after {
      filter: brightness(0) invert(1);
    }
    .faq-dot {
      display: inline-block;
      width: 10px;
      height: 10px;
      background: var(--primary);
      border-radius: 50%;
      margin-right: 12px;
      box-shadow: 0 0 12px var(--primary);
    }

    /* 表单 */
    .form-control-custom {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(10,132,255,0.2);
      border-radius: var(--radius-md);
      color: #fff;
      padding: 14px 18px;
    }
    .form-control-custom:focus {
      background: rgba(10,132,255,0.1);
      border-color: var(--primary);
      box-shadow: 0 0 15px rgba(10,132,255,0.4);
      color: #fff;
    }

    footer {
      background: #060A10;
      border-top: 1px solid rgba(10,132,255,0.1);
    }

    @media (max-width: 768px) {
      .hero-section {
        min-height: auto;
        padding: 100px 0 60px;
      }
      .section-title {
        font-size: 24px;
      }
      .metric-value {
        font-size: 1.8rem;
      }
    }